First person (I and me) is fine to use in this essay. 

The deficiency of this neurotransmitter is associated with Parkinson disease.

This cranial nerve functions in the sense of  smell:

Farsightedness is more properly called:

Earache:

Farsightedness is more properly called:

This portion of the nervous system prepares the body for stressful or emergency situations, commonly          called “fight or flight” responses:

The brain begins as a tube-like structure called

This portion of the nervous system prepares the body for stressful or emergency situations, commonly          called “fight or flight” responses:

The protective covering of the brain is the